it is a japanese army parade saber
from late 1800's/early 1900's
worth $100-200 or so

I am going to clean it up a bit and hang it somewhere.

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If you're sure about the age and type of sword it is don't clean it yourself get it done by a pro, you can mess things up doing the restoration on your own pretty easily. Also if it's something you want to keep as a collectors item, see how restoring it will affect it's value.